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. 2021 Sep 13;12:5409. doi: 10.1038/s41467-021-25677-2

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — a Schematic energy diagram with calculated NICS(1)_zz values (in bold) at the optimized geometries of p-DAPA. b Calculated NICS(1)_zz grids parallel to the molecular plane of p-DAPA. c, d Bond lengths (Å) and HOMA value of p-DAPA at the S_0,min (c), and S₀@S_1,min (d) geometry. FC Franck–Condon, min minimum, NICS nucleus-independent chemical shift, HOMA harmonic oscillator model of aromaticity.